<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/user/save">

    id: <input type="text" name="id">
    username: <input type="text" name="username">
    age: <input type="text" name="age">
    <button type="submit">提交</button>
</form>
</body>
</html>